基于传热分析的林火蔓延特性研究

计算了水平流动的热烟气与大乔木、小乔木、灌木主干及大乔木树叶间的强制对流传热；垂直上升流动的热烟气与各类林木的纵向自然对流、纵向强制对流传热；以及烟气对各类林木的辐射传热。分别比较了它们的热流密度和总换热量。讨论了烟气流速、温度、林木尺寸等因素对换热的影响。在此基础上，对不同林木的火险特性进行了预测。

Studies on the Forest Fire Spread Based on Heat Transfer

The forced convection heat transfer between the horizontal flowing smoke and trunk of bigger arbor, smaller arbor, bush, and leaves of bigger arbor was calculated, and the natural and forced convection heat transfer between the vertical flowing smoke and all kinds of trees, the radiation heat transfer between the smoke and all kinds of trees were calculaterd as well. Their total quantity of heat and density of heat were compared respectively, and the influences of velocity and temperature of smoke flow, size of woods, reflux zone on heat transfer were discussed as well. On the basis of these, the forecasting of woods' fire hazard was done.